mclean



Patented July 1, 1919.

Mrew/ars W Maw NZean TATES' ROBERT MAW AND WILLIAM B. MGLEAN, ,OF MONTREAL, QUEBEC, CANADA, ASSIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, TO THE UNIVERSAL MACHINERY COMPANY,

LIMITED, 0F MONTREAL. GAIN'ADA.

COMBINED FLUID-PRESSURE PUMP AND MOTOR.

Application filed May 29,1914, Serial No. 841,969.

To all whom it may concern: 7

Be it known that we, ROBERT Maw and WILLIAM B. MCLEAN, citizens of the 'Domlnion of Canada, and residents of the city of Montreal, in the Province of Quebec and Dominion of Canada, have invented certain new and useful Improvements in Comblned Fluid-Pressure Pumps and Motors, of which the pump or of the driving means therefor..

A further object is to provide a pump so arranged that the suction and discharge may be alternated at will.

A still further object is to provide a pump for use in liquid transmission systems so arranged that the pressure of liquid is not directed entirely upon movin parts, whereby friction will be largely re need.

To accomplish the.a ove objects, a shaft s provided held against revolution, but per mitted limited bodily movement in a lateral direction. A casing is revolubly mounted on the shaft containing acylinder member, also revoluble on the shaft, and connected to the casing by pistons slidably mounted on the v easing. These pistons are open at both ends, so that the pressure of li uid is directed largely against a relatively xed part of the casing and not entirely against the piston which slides on the casing.

lln the drawings which illustrate the invention:-

Figure 1 is a vertical longitudinal section of the pump. I

Fig. 2 is a cross sectional view on the line 2*2, Fig. 1, showing the arrangement of cylinders, pistons, etc.

Fig. 3 is a cross sectional view on the line 33, Fig. 1, showing the connection of inlet and outlet pipes, and means for shifting the central shaft.

Specification of Letters Patent.

Patented July 1, 1919.,

Renewed November 27, 1918. Serial No. 264,466.

Referring more particularly to the drawings, 11 designates a fixed casing containing all parts of the pump and having mounted within it a revoluble casing 12, which may be operated by being directly connected with the shaft 13 of an engine or electric motor. The revolving casing 12 is rigidly connected to and concentric with the shaft 13, so that one end of the revolving casing is supported thereby. The revolving casing 18 also mounted by means of ball bearings 14 on collars 15 and 16 mounted on a central shaft 17 and slotted so as to hold the central shaft against revolution, but permit bodily more ment in the radial direction of the casing. The collar 16 which is at the opposite end of the revolving casing from the shaft 13 is rlgidly mounted in a web of the outer casing, and thus supports the central shaft and the revolving casing. It will thus be seen that therevolving casing 12 is supported at one end by the engine shaft and at the opposite end by the collar 16, while the movable shaft 17 is supported toward one end by the collar 16 carried in the casing web and at the oppos1te end by the collar 15 mounted in the revolvmg casing adjacent the engine shaft, so that it is held arallel with the engine shaft.' The revolving casing and shaft 17 thus partly support one another, and are each partly supported in the outer fixed casing. The shaft 17 is flattened, as shown at 19, where it passes through the slots of the collars 15 and 16, and is thus held against revolution but is permitted a lateral sliding movement.

Within the revolving casing 12, the shaft 17 is provided with a circumferential flange or enlargement 20, upon which is revolubly mounted a polygonal hub or sleeve 21 carrying a cylinder member 22, having a plurality of bores 23 arranged radially of the shaft. Theshaft is of hollow formation to provide inlet and outlet passages 24: and 25, which communicate through ports 26 formed in the flange 20 and ports 27 formed in the hub concentric with the cylinder bores. The ports 26 and 27 are on opposite sides of the shaft, and are so arranged that their common center line is at right angles to the direction in which theshaft is movable. The circumfefential width of iii-emc e is apart at ten 9 arthi t e cir u r nc the flange, and the ports are arranged equiguides 28 arranged perpendicularly to the radii of the casing, equally spaced and equal in number to the boresof the cylinder. mein-.

her. In each cylinder bore is-a hollow piston' 29 open at its outer end and provlded with laterally projecting flanges or shoes 30 which engage in the grooves of the guides 28 Y and hold the piston against movement either toward or away from the casing center, but permit a bodily sliding movement, the. ie tons remaining perpendicular to the guides. These pistons are open at their outer end so that .what may be termed the head of the piston is formed by the guide itself.

,4 Supply and discharge pipes 31 and lead respectively to the inlet and outlet passages of the shaft, and may be connected thereto in a variety of .ways, of which the form shown in'the drawings is one of the most slmple. TlllS arrangement consists of a clamp 33 closely surrounding the end of pipes.

. the

' ranged in any suitable number of the shaft 17 and holding the pipes rigidly thereto, the clamp forming fluid'tight joints with both shaft and pipes. Passages or. ports 34 are formed connecting the pipes and the passages of the shaft. The pi es pass out of the casing 11, through' stufiihg boxes 35, which enables the entire casing to be filled with oil or-grease under pressure, if desired, without any leakage around the An advantage of. this particular construction is that the pipes themselves may be. used as supporting and shifting members for the shaft, and thus obviate the ne-- c'essity of forming 'a sliding j'bi'n't between pipes and shaft "capable of remaining tight under high pressures.

It is obvious, however, that instead of the pipes 'being connected to the shaft by a separate clamping member, the shaft ma have the clam-p formed integral therew th, as shown at 36 in Fig. 6,- which is a fragmentary View corresponding with 1. Numerous other modifications may be made in the structure. In the form shown, eightcyl-. inders are provided radially arran ed in a single plane. The number of cylin ers maybe varied as desired, or they may be arlanes, thus multiplying the number of cy inders and increasing the power with only a very small increasein the size of the machine.

When the device .is used as a pump, power is-applied to the shaft 13, which rotates the casing 12, the pistons 29 therein causing the cylinder member'22 to rotate simultaneousl around the shaft 17, this shaft being 'slid supplie It will be noted ends, and this able in a lateral direction may be moved into "or out of concentric relation with the casing.

When the shaft is concentric with the casing, it is obvious that there will be no relative movement between the pistons and cylinder, but when the shaft is moved to eccentric position, it carries the cylinder member with it, so that as the casing revolves, the pistons will reciprocate in the cyllnder, owing .to the varying distance between the cylinder center and the"'perip hery of the casing. This causes fluid to be drawn in through the passage 26 as the pistons move out and to be expelled through the passage 27 as the pistons move in. Accordlng as the shaft is shifted a varying amount of eccentricity,the stroke of the pistons will be varied, so that the amount of fluid passed through the apparatus may be varied w1thout varying the speed of rotation, even to such a point that no fluid circulates although '37, thus reversing the direction of the flow of fluid, without reversing the direction of revolution of the apparatus. It is also obtor if the fluid is supplied to one side or the other under pressure, the. direction of revo- 'vious that the device may be used as a mo- I lution being determined according to which side receives the fluid under pressure. By varying the amount of eccentricity ofthe shaft within the casing, the speed of revolution and torque delivered by the apparatus may be varied without the necessity of changin the volume and pressure of fluid that during either the intake or discharge, whether the apparatus is used as a pump or as a motor, the fluid passes through the open bottom of the cylinder and through the tubular piston, the pressure being exerted in every case against the guide 35 which is a relatively stationary part." The only pressure against the pistons is on the small annular area of their inner pressure is merely sufficient to hold them closely against the. guides and .form fluid tight joints. By thus eliminating Having thus described our invention, what we claim is y 1. A device of the character described comprising a stationary casing, a revoluble casing therein, a shaft mounted in said easing for bodily lateral movement from one side to the other of the rotative casing axis and held against revolution, cooperative pump members mounted between the shaft and rotative casing, fluid inlet and outlet passages in said shaft, and shaft shifting means forming supply and discharge pipes cornmunicating with the shaft passages.

2. In a device of the character described,

a fixed casing anda revoluble casing therecasing and ..an inner revoluble casing, of a shaft having flattened portions, a slotted collar mounted on each flattened shaft portion, in-the slots of which tlidshaft is laterally movable,one of said collars being fixedly mounted in the fixed casing, and ball bearings supporting said revoluble casing on the shaft collars, and means holding the revoluble casing concentric with the fixed casin v 4. device of the character described comprising a revoluble casing, a non-revoluble shaft having inlet and outlet passages therein, a revoluble cylinder member mounted on the shaft in communication with said passages, guides mounted in the revoluble casing, and open ended pistons mounted at one end in said guides and at the opposite end in said cylinders whereby the guides constitute piston heads.

5. In a device of the character described, a pair of relatively revoluble members, interengaging radially disposed pump portions carried by said members, the pump portions carried by one of the members having slidable connection therewith in a tangential direction.

6. In a device of the character described, a pair of relatively revoluble members, interengaging radially disposed pump portions carried by said members, the pump ortions carried by one of the members havmg slidable connection therewith in a tan gential direction and guides in which said members may slide, said guides forming the head of the adjacent pump members.

7. In a device of the class described, an inner and an outer revoluble member, radial cylinders located on the inner member, radial plungers coacting with said-cylinders on said outer member, guides on said outer member permitting tangential movement of said plungers, and lateral flanges on said plungers engaging said guides to prevent radial movement of said plungers.

In witness whereof, we have hereunto set our hands in the presence of two witnesses.

' ROBERT MAW.

WILLIAM B. McLEAN.

Witnesses: l

S. R. -W. ALLEN, G. M. Monnnann. 

